• coltan refining plant

    Refinery Coltan is a mixture of columbite and tantalite, both valuable Tantalum ores. Useful in capacitors throughout history for many high tech and electronic

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  • Coltan - Wikipedia

    Coltan (short for columbite–tantalites and known industrially as tantalite) is a dull black metallic ore from which are extracted the elements niobium

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